<h2>Comments</h2>
<pre><code>% This is a comment</code></pre>

<h2>Commands</h2>
<pre><code>\begin{document}
\documentstyle[twoside,epsfig]{article}
\usepackage{epsfig,multicol}</code></pre>

<h2>Math mode</h2>
<pre><code>$\alpha$
H$_{2}$O
45$^{\circ}$C</code></pre>